He added: “Paul would call Hannah all the time. She used to listen to him whine on the phone – she’d put it on loudspeaker and walk off and leave him to ramble.

“She used to say ‘ugh – I can’t believe I used to have sex with him’.”

After the band reunited for Children in Need last November, Hannah became increasingly busy.

Adam said a stressful few months led to them taking a break from their relationship in April – a fortnight before Hannah went on tour.

He moved out of their shared house hoping space could fix things.

Hannah continued to call Adam, even inviting him to her hotel after a London performance. He said: “We sat up for hours, talking and joking, just normal again.

“The next morning her attitude completely changed and she wanted nothing to do with me.

“Later we met in a restaurant. She was all over me – her legs were across my lap and she was asking me to massage them – it gave me hope the break was having a positive effect.”

Then, last week Hannah sent Adam a text saying she wanted to cut all ties. Adam recalled: “She said ‘I’ve moved on’, and I knew something wasn’t right.

“I cycled straight around to her house like a maniac. I walked straight in and there they were both sitting there.

“I wanted to understand why she was with him when I had to listen to three months of her moaning about him being so fat, letting the band down, not turning up to rehearsals, ­calling her every night and not leaving her alone.”

Adam added: “I loved her so much. She was the most amazing girl I’d ever met.

“But overnight she just changed character. She wouldn’t speak to me, she didn’t want me in the house. It was weird.

"We hadn’t drifted apart. She cut off emotionally. She was like a different person. I don’t ever want to see Hannah or speak to her again.”